2. ii) An object, 5.0 cm in size, is placed at 30 cm in front of a concave mirror of focal length 15.0 cm. Convex mirror . The distance measured opposite the direction of … According to the new Cartesian sign convention, the pole (P) of the mirror is taken as origin. Term : Concave mirror . 2. The object is always placed on the left of the mirror. sign convention used for reflection of light by spherical mirror. In this convention, the pole (P) of the mirror is takenat the origin of X -Y coordinate system. All the distances parallel to the principal axis are always measured from the pole of the spherical mirror. The object is always placed to the left of the mirror. At what distance from the mirror should a screen be placed in order to obtain a sharp image? light must fall on the mirror from left to right. The sign conventions are as follows: 1. Sign conventions for reflection of light by spherical mirror are: 1. Find the nature and the size of the image. 3. In a convex mirror the reflection of light takes place at the bulging-out surface or convex surface. Reflection and Refraction of Light & Point of Incidence Sign convention in spherical mirror & Refraction through a Rectangular Glass slab. II. Objects are always placed to the left of the mirror i.e. All distances are measured from the pole of the mirror. Sign Convention for Reflection by Spherical Mirrors The new Cartesian sign convention is used for measuring the various distances in the ray-diagrams of spherical mirrors. We will use the New Cartesian Sign Convention for the reflection of light by spherical mirrors. Shikha Goyal Feb 12, 2016 17:36 IST. Explain the sign conventions for reflection by spherical mirrors. Sign Convention for Spherical Mirrors (Concave and Convex Mirrors) Distances are to be measured from the pole (vertex) of the mirror marked by point V in the figure. The conventions are as follows – (i) The object is always placed to the left of the mirror. 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